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A key challenge to the application of continent-wide feather isoscapes for geographic assignment of migrant birds is the lack of ground-truthed samples. This is especially true for long-distance Palearctic-Afrotropical migrants. We used spatially-explicit information on the  δ   2 H composition of archived feathers from Green-backed/Grey-backed Camaroptera, to create a feather  δ   2 H isoscape for sub-Saharan Africa. We sampled from 34 out of 41 sub-Saharan countries, totaling 205 sampling localities. Feather samples were obtained from museum collections (n = 224, from 1950 to 2014) for  δ   2 H assay. Region, altitude, annual rainfall and seasonal patterns in precipitation were revealed as relevant explanatory variables for spatial patterns in feather  δ   2 H. Predicted feather  δ   2 H values ranged from -4.0 ‰ to -63.3 ‰, with higher values observed in the Great Rift Valley and South Africa, and lower values in central Africa. Our feather isoscape differed from that modelled previously using a precipitation  δ   2 H isoscape and an assumed feather-to-precipitation calibration, but the relatively low model goodness fit (F 10,213  = 5.98, p<0.001, R 2  = 0.18) suggests that other, non-controlled variables might be driving observed geographic patterns in feather  δ   2 H values. Additional ground-truthing studies are therefore recommended to improve the accuracy of the African feather  δ   2 H isoscape.

Toward a Deuterium Feather Isoscape for Sub-Saharan Africa: Progress, Challenges and the Path Ahead